There are a few reasons why the download may have been disrupted:
1. Antivirus, firewall, or security software may have disrupted the download.
If the download gets stuck at 1%, or if you experience a connection error message, you should start by temporarily disabling any firewalls on your local system. Many antivirus or internet security software packages include a firewall. You should also try disabling any firewalls that are built into your operating system.
The most common cause of the download failing once it has started is due to an antivirus or security program interfering with the installer. It is recommended that you temporarily pause the protection from any antivirus or security software on the system before performing the installation process. Once you have disabled your antivirus, close the installer and try launching it again. If you are prompted about overwriting existing files, select 'Yes' to overwrite them. It is preferred that the installer overwrite any left-over files from the failed download so there are not any corrupted or half-completed files remaining on the system.
2. Your system may have gone into 'Sleep' mode during the download process.
Check the power settings on your system. If you walked away from your system during the installation, and your computer went into 'sleep' mode, this will disrupt the process and you will not be able to continue with the installation without completely stopping it and then starting the installer again. The installer is designed to prevent the system from going into 'sleep' mode, but some systems may still go into 'sleep' mode if you are not interacting with the system for a long period of time while the installer is running.
3. Try rebooting
Sometimes installer gets stuck downloading itself, therefore try rebooting your MAC and wait for some time and the progress bar would proceed eventually.
4. Progress bar shows incorrect data.
Try to go to your MATLAB directory on files and right click to properties. The size of the file should be expanding with some speed. If that's the case, it could be something wrong with the progress bar itself. Also try unchecing many of the toolkits since they could be manually added later.
